Elgar enigma/ Picture at an exhibition

For Pictures my choices would be Szell with Cleveland, there is also an SACD version, that I have and is worth it, if your system can play them. Next would be von Karajan's

Elgar's Enigmas my favorite is Boult's others will have others. Both have many good recordings to choose from.

For Pictures at an Exhibition, you can't go wrong starting with Reiner and the Chicago Symphony Orchestra on RCA. It's one of the great performances of this work.

For the Enigma Variations, I'd recommend starting with Monteux and the London Symphony Orchestra (RCA, re-released on Decca). Also a highly regarded performance of this piece.
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thanks

$50 for Szell with Cleveland in SACD. wow pretty steep